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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6898b97ceb6432856c0767dd8873478b290123d61a69cb4f6fcbb6ccc5714fb' 
  AND token = 'fT3pEzas9YMzQBaPruVisxOaeeGcaXfAoxS9TFuiioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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