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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933c982c7893da08d44f4ae3a6796c7ab94ca89b9d01cbe09d292c9597362eed' 
  AND token = 'KbR1T171qipCvpAMjDJvgnA1MU0Wq89t6w51D0BxeEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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