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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838dd1e65ef10fb7473fc4d1587b58c4451edc9dfa235fc004204863616d2077' 
  AND token = 'Mv9210quwWVCZRHaV74HUX22O47Ufg1TcDvc0cFtLYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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