SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201db3e87629bd47f33be6c1f9d77e1f52fe50e88a5f728ea76d758956e30109' 
  AND token = 'JYyLL/z9hIntP7ip2GLvHp6gGJckB13JOd/jD0+2Gsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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