Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e58b208bd8525a2afa97d4fa858f0397d5627a65fae34e5b254b8d2fa81b5a' 
  AND token = 'LjH0VszdO26loHfNMWrTDBrZ4NrwwLRFrJHZLk3/nqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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