SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a92c4602c1fda962afab0c705acfdf4e7785e40f9a0b693ed048129c7a8613' 
  AND token = 'zvoh/XuHs9nhyBoBW1qvj7HQYBZUq65ftkH0wQR3LaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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