Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc810d0bfc8919d5f2d7ebdc79f34191c0ed0756abe9379c32c24e3f153fdb5c' 
  AND token = '6at/zeUWyFXAgCY9Y08dscNEoSvKoC/FnnkT7k+Hc7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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