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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24515fbae3159a484ccbbf6ad428b476101bd7dc6dd5b2612853c2398631573f' 
  AND token = '+L8MMbroblwsj4y72b5AG6py+/ZXyUVS/kdaBJ/grfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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