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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c959c7caaf4922c8d55a60f0e05caa543b90de50f2a7f22a4f54d4561e02982f' 
  AND token = 'wOgZZQrDoHl6my1/3ghvxW+hC99cxio+w1fYYp6ZrMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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