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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410db89772c93f37ec73f4fc4d5b76cd291e5616492ad9eb7e4c46ca11adf6e7' 
  AND token = '4GYTtW17QvdU0K9ZSknGPyAkd0mz3UzmW4L8+EFZAp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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