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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7f1b71a857856165816a403026b6496076725b9b064dcd2f08417113da2c60' 
  AND token = '/6xwGhydO/QLUZhhhphm3DP8iE0oU2ui3WvqBfA7cic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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