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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6554e88c811e61ad03a3bb537544345b4791e6c4b4ec81e4a379c162eff201e' 
  AND token = 'JBzf+Nr2zGae2t74nPHXtIGqDZJ7DWKsotojOv82nq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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