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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b36c5d8072c4bf4cc432606b3e6d8b9237428f04636ab8a9cfe91766fff364d' 
  AND token = 'tUT5VS13cYrJT7vv0/p9XFOJcTbCpH7MqfL5NhqRiwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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