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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2c1cd77bc9c8b332ebab543ffd363913f6d3b634a356f807d8351c82516d96' 
  AND token = '6NleTITUxTg4DZjBNp1o6IIs11Y3hxFGz2cyTYqyboQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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