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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404796621d584b9d1b974a77170cd37976549b3f6c3db5cf574cd90f832b90ff' 
  AND token = 'rM+F4erDu914sWOMMiBE936C5SE1dCDyEMYZ238E9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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