SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39ebeae9f43fd5ec042ce4b992190fc957f2b5821206c14bbda6235f4369d66' 
  AND token = 'rF/4W39ZRhK7PpAgtK2zYzPicHAwl8MyXeJj38m2vLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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