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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7fc11f979e87a3d24be26c81726bd5ab3a783aeb9d8d8453208d400ae3507d' 
  AND token = 'aXiDhDBK+juhkvg9S4TRgNXbGBCU5ywCSlx79T0WIGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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