SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d63455026d43814b7f39aa024226feadc33fa55b3a0a355cd290b31a2be998c' 
  AND token = 'NNLcjw6VKkRvvp3/hbkMoRGAFW8xrzJYmgwZlDNOdqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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