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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d61ee2b28794ae03c5c64bee14fe172cf8d8966c07c6968e1f7e365e79be60' 
  AND token = '5FS4EcUZPNGOlKfOw0frota3qPT7DOALgLZ4v+pRUdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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