SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224d3776247524db688500056d7b32d921ac95159be15e10743da74870f2ae2b' 
  AND token = 'Q1zYewfGS9cYDq3hvggIvBjPkDEBPh1ddTiuQgWm6QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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