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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35960923bf0b03565aa1a7ccb110c63f3eb9927388cc238b31599dc28eac8dbc' 
  AND token = 'eajYbVipcKrSCKTMJCh1E0MGgUBBzN0LxCEGadv2SrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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