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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b165dbaca17e2ca25e9ac4c439bd18d36e9761a871aeef4b9bec6d4cb07cb9e9' 
  AND token = 'u78UKJsUUe37rjarhk44lxlBbq/4xGjZs3KKQr8wHwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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