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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc16bb4ba48b8d07e07aed73256aa20814c9f4b7a173042560f1fb9842dcea4' 
  AND token = 'a88fcXc8DkrECS+6vheo87pmXfHyPyo+80JtY+0DIJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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