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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c43a8ef1a25fb0fb23d4634fc770778ce257eb30ed0d6277cfc414cc623bc8' 
  AND token = 'kd1sL/77eaKvYXe18FANR/1bQRUro27FAS3UZ+dRb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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