SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bccf5e7516a2e2a7bd5e7c965619d788cdafdca3aa3474b8c033f7b2d138681' 
  AND token = 'fcieykqlogWpgp0jp3CFULLJL2KW98GTGTYDzVx6hAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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