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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c0ca8bdeca8226400cbaa01ea3394d829ae06132f8bece8ac15491e6f60ce0' 
  AND token = '5pX20xhdcivRnHo3B2FUXyIkBJiyvcLsFE8VDtlUGz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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