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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c559bbf32d529c074561bd1b7d61f513994c8844121712a356b5442c2ae1d5' 
  AND token = 'al07BSEjZ6LkuuLhwiq8dMyXItTF5TuADTAFbN8yABw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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