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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e561bd486d6611de268ba742bbd12d67b5c29ea12b0e3c1b380a4af00c4847' 
  AND token = 'DZnd+QTbg8urmVTJTmBpgb8WGZfkWb+NAy7tjbj7evM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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