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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db002623853a496508dde7f6c466bf3d80b10c0b4f4352bc6452290a173d0ede' 
  AND token = 'q19tm0GkLo7vweseUoMgVh5P5ieOCi90hm1SBK0rMXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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