SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c11230cb38752ae76c569a96af1d463c28cb432f27d9a73ff65e99dfbfa105a' 
  AND token = 'wBMh7exsl2Kdh4a+2K9mSjFiDWjMalZWlGp5wNgr/sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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