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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241b4667cc84a273da5d61346ae11bdac1ae50cacf972cdd3bf980c42b01e647' 
  AND token = 'QEqLmXHRgEgte6jbeLqPOm9Sz22IDvy168XgGg4QRf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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