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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f07a256b7bd8361ba8b97b90b92096a0c72dbaa7c93b58bd88c9c5ae765c35c' 
  AND token = 'q+c0QSjKZECwVAOR9ijizIDBU/w4HEKyfW6Ybdby5+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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