SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9893c83d39c856cc1b33c1d2a6f38edb2ad6635c8877f27fa0e07422a38ed2e3' 
  AND token = 'uiYZfmTp0ksPvwDV/nWRGKS8tJBZZiftcBXXXhpBYxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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