SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ef8ed03d9f3840825716280ce2de93240405ea6b4e609bb8ac45745fa5d25c' 
  AND token = 'JGNwTP5vYaxHXg6VSXXxYis+ByvVOoxRrwP/ruDwxmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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