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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd59e1db5246c0930868e557632d35a38b9d38f48bc2d814f82eae2a9872e6ea' 
  AND token = 'e8m25hrmo4VlVmrtvdlhFMovtMB0WBocyOwDN3YQ7aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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