SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1165ba829861045d8965ea2ff1ed8272ec9d8c1f1a516c0d5872b3352d34779' 
  AND token = '7YsyVuPTkwdQDs8BFyqduHObeZLuKwi+QWyaro1n/hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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