SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e17f3d9781b70225dfdc67bfaf60082431b166bd178b287a5123b0bd063e9a' 
  AND token = 'wilxOqy4eO2rdU1mZGqhBJKtKAITjAUGDXJNLEdFwgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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