SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e48aea4a714b9b0c17616b3d2036a1e952a71d2a7a71e39ff76db5b968467f' 
  AND token = 'vXrQkmBgeqi8VTKdw8xBLZpw2zz+6PRzXvUZwDtMi+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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