Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc8efbc816f88c6dcd79f1269ec858372f6673c8605260cfb2fe2bafaf3b057' 
  AND token = '5OXtZxToEjOyObCTLYUa7kaNTeTVt+cUH3JFnaSdAv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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