Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15be831ba9192f43823267e26414558de8502bd6097fd7a0581c28b92eec3ba' 
  AND token = '0Lz+tQ+UzlF0EhAsTyNydR2HZifFoVnbMcXmVN3irBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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