SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c605b9924077471abc10a811337becde8fa17739486b84f2e8b1771dfa8699' 
  AND token = 'nU/u2BRUqeeYm+K+EGy2ov1wFi5kWpJzGcM3/Tyx2cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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