SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338715baa9e41d28b7a1f8ba735c796b5a626beed44c9e8c74d13c224b9f6238' 
  AND token = 'jy/MKLIEsHtB7Q8migCzqsxAmPmTIOFq5NtVQ95h4wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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