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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea2b68c40b8a2e764997d17bfb06919681324693bc721bd22228f3770a98202' 
  AND token = 'GNUEjLr06thHPVuZB2ow6Zxn2D3ciTlSIuB8NZXZkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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