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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd67253a4517d242c0818859f41feba93d49aefdb59bd6ae2d39602dc6cfbdd' 
  AND token = 'zo6RUdBTsuu4NbSgulzHpxoYCMJK2iyf1qEZvDkfstk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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