SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72452b5384c008af71cdb363585b215c6c3c74738107a61068efab88ff67b419' 
  AND token = 'g0OZd4JWtWCpLGoZVnJ2GLGdSxVG37ghosRqKYV0yPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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