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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99747ffe9e05345fb6a8ea79c1bf46d6f5b54cb360fcd7c8bf8ffcb751f62fec' 
  AND token = 'kJZXRr4mPZVvzoddKflCrBYyNuT4GL9lOlBp91x7gPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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