Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df302fb75df0a50203c402104b5940f971b8323a12c8753c4c0d2ce424ff193c' 
  AND token = 'PA+ZSSp3HfUK97bbFzdPEFYTq3r0N+fcnhKK7DB+ELo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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