SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b9283fa2e61712d4a3594249983b41607e60a7cfac239f73dd50c9ca1de2f1' 
  AND token = 'wlgmS7h9Ns4SP1JXQRgQyjkiPq/RK+C8qsD0GxP2jws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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