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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cb5c818f6a63e7bd5adee1fd36b1dd95559f4a4f44f7673ab756237bf0277b' 
  AND token = 'dglWr5n6NWLiEPafv2WJjed1qBklEQvX7gFJsQZzjWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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