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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfc316465f5714e1eeede56a91490eb7c5763edcc91c0a688f3eecde1cde6e5' 
  AND token = 'KnQv3v/iRKdKN+6z1XnNuL2H2vERDRryF8zZbNYB7WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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