SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3baf4485b27eb4f413daec747fef94356f703c26143ea2422cb2527c8daba11' 
  AND token = 'SasHo9GzUggvpxwOERs3+8f5YQueKg5WYhl/G/ok7vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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