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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed2f710abe8a643119f87361b6c998981e4449f796812ac32af7a26f511aab8' 
  AND token = 'aQfeKWvsLWXzToQchM7LcoBuq6FvI57lHct58+0jMkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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