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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579494757f455c69c234cef00031215a5c0c86cef1319a4572d3395a4cf179ee' 
  AND token = 'g8BnGaDRnQo0afaG3N6qLG7rIAgjIqpwU7ZT4l8Jnpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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