Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e275285f62f3485c71db898be56bd8760d410f9b6a559ab2139ad323d8ad73bf' 
  AND token = 'iq1f8kqApBpTOMY7EAfXS51kVDbdm6zb+iylZ4Ulb9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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