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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd664ba7a867585d56268f83316cd7acd35add79c30fcec10b8167ce9dff5af7' 
  AND token = 'k0eVTfDWnUMj3U0vKfjAkdFxDUwwjEsc38h+ax939/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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