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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7b2412bbfb4027548b5682aeb3f2b1d256a68322f161fc022e35f2a827dac8' 
  AND token = 'jJbCkUnUb5VriYrONThvz/ExItayN0hO8PzUqrxKeD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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