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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64894b3e1c0c05aed7bf12cf4f1d07c1e5a943454ee1a08356ac421b116cbae0' 
  AND token = 'mLaXi8j+DV5/PX/638QFuPra6fFIRUbPhlcXSidK6yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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