SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07be7ab45c1fc1ff2c943b263807704981fe65b989ea0a4ba7ed9c15a9897e6' 
  AND token = 'je/KT6vjbEE6TdWi+SK1bfXqoL3i0yPvdsMl7q5bMtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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