SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edd033a5b4f872ff3492e852f32c7ad72389525a4802d1768b14f583d981b3c' 
  AND token = 'FYXKXV9cqKZx+rvKddtyaBYKi9MFgYl3RDQ019GXVMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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