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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c43a161405f790e542b47b60008b7e6a06157bf0b8073478a37d4f4c50ddf9' 
  AND token = '1EeqsiguLTVLokKmILf/TmMBiYqWsvj8g7G8yen7q+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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