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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc02e7f3bfe0909614beca144a671ed6c5aca7ecd56e12082caf8d4c3f4e773' 
  AND token = 'yjb69SZ+NBfyEOQC7nk4fc0mYxKGA7ApfqtiWSalVQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}