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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c811229bca26a0cdcbf6d42d0786c7e277ccd9a002af9f8a83524c0e30ac77' 
  AND token = 'dl9r+GdNJ83YFDf8B52kCAe7KZBHTtiGTjXAF/yUCiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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