SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d361002d8a1ef5bf7d96b395a3037e464ec4df9d06d48f31482834a1ca8194a' 
  AND token = 'fJhlpRZFtEidgq+ouhPAzSo7IR2PY6Rxp/FCRCWggYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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