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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db20ea9e8279363b90512aaa099ba1882cae5e096ecd5aff6f179650ce13f4f' 
  AND token = 'rAkj8op9KDzlVs2nBi7/7NzUq3Hbf4EyEoQob8Q9l00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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