Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92d5c9dcac2c740cc9016e090936285641f3ea5c03ae307092ea61c0617de17' 
  AND token = 'NWPqf7e3VEbC29aUp354BySAy50buI5PSmhj7gK4HVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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