SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314db0d4eb3a672b81945fdedc5e866133ec8bee3893d72d38d73a9d29d56c1b' 
  AND token = 'JYZGHvXrxFJfW3Rd4p2P2BK+ewzPtbWRNlmLmLLfwjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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