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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ca2cec4fa2a8ab77da71a6cc4901bb6816a34cd8d5f6ec9d9cc9ece828638a' 
  AND token = 'LC7LWSA0WQsmprZegnMnSP3X9gxuENM+RcqaCfPHhz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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