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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc429317d9749599b825d18d3c4343f946588401ef45c8f72f28c973628f1e9c' 
  AND token = 'KLeGBpulP1muYQcfL3Ml+B9I8qrFHPZYIApO3uLh6i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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