SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e80116dfa232b4aa92060699353eecbb4838e339d9a1f6efd44e7857eddcf5b' 
  AND token = 'NJfGpZjXThJ54p5fa+PjJgjhPIKJGDZf45B2oKYaqMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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