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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61810e56f990205e7a91152f4a816ab5d34f1f0ee56ffeabf6f48cf2e0e04844' 
  AND token = '7YfrI2Lwlg65/+KNmg8GpFAqnCdoTTW6lI5Chg1CQhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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