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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de36c5be552a34c3569eb1663fea9341f7b7906d1894093d5e450bd02833abd' 
  AND token = '+lts00/jvcY3mmmDhNG6Qxv7bEavrcpWXuAfZd32ac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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