SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658900a12723ea3e661b239e39ff16a2c1b541fd67b6ce2c918387d9d90915f3' 
  AND token = 'U8/TXLDdY4yWqUZzMuMH7ignnpTp/K9TIpGhh+ptNDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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