SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bbafa5676bef3f2462d3211deaea49fb233a3e3edbcc96c90b5b500fe8fb82' 
  AND token = 'TC12VYYyF/xjUZigNg9E7xOw/H5i+QVOLvJlBXT4BUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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