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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387b255e5bbe76bacdd088cfc1df23d0dc1f5402d30fe250d62b5484ae3d1a6a' 
  AND token = 'QTPHBZlPu6fmWFHudpLoC9g9Q0TRp5zO2x+hz33zP8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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