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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdf61ee7617d045e49434ffb5ab1db86ade4ba78209fb563f98b34d7afd0283' 
  AND token = 'bf5fntc9B86T2gS6y1cXpA9XQ46totViFnoR525BI78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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