Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7664360ee3166afb42f4014fb2b7d4690514acf40dbfea3cee4071cbbc65402' 
  AND token = 'iDz5ACMGSbQgRQEyMtNbqSxqgs95BHVj28cqt4zyC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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