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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b48f03727e6173aad1f09009efcaa7b2bd2523705011c881aa27ed173b6de0' 
  AND token = 'WoFPRqEX1Cxnp9PKxx1Ryeq7wIKUdRVl8fcCX0h1WIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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