Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50df0d6ee8785971487b49cb02338e4c233dab41ea4f73d12246a385492e7fd' 
  AND token = 'd5aBTo4wlSKe27HlalGL08yNutccd+62rMmuJeP0lJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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