SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c3063fcc3d9b65dc2a608b17f430aa47167d47f04994408a4c45bf82095b9b' 
  AND token = '5VsO+wZ72mLrvm2Jrwu19uWvS7461hyGb90YdwX8Y/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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