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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa37290f0521ee314803cfca7ca4f2642cd173b57ce3cec6232fb5a9be619ee' 
  AND token = '/KFsPr2iVaqr9Zreiuk8cJV1TkgniO61qT9XH6LvwAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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