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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9989bf4105d84dcec9278936c465aff5c8883834fcd2613cd2838c268f370bf3' 
  AND token = '8qggkT/9GHJIwfZASaVEn55hmCsGFrfov/yASr5ax10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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