SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc235f2a47fbad7912b2f8eaae70f0c4bf13459bac1574a48f520bf9ea7a319b' 
  AND token = 'eG4Oqt867LK+qtYYysnxqhgs5XlCm+/Caj9HqEA2MwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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