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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6333435afd807a8e7ed3373f233734d0c6af0bb143e8f13bad9c7f0444ee9c4' 
  AND token = '9yrXv4yU9I47DzY7W8SnSpJo/S4l8NGjxi8U7c83kug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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